sure Update from today !!
I came back from another exercice 2 days ago , so yesterday I started by removing my exhaust to fix both core since they were losse inside and not being aligned properly
then I swaped my Now really blown 3.9 Diff for the one I bought not long ago which is now a 3.5xx gear.
today I re-installed back my HR intake manifold

during the install I decided to look how much oil was inside of my oil catch can !!
Let me tell you it was pretty much full !!!!
No wonder I was seeing smoke under vaccum at high RPM !!
the catch can is about 2 '' wide and 7'' tall
tomorrow will be a nice day and I might ending up to tune the car in the idle aera , I had a idle problem for a while and never had the chance to do anything about it...